Jordan Brown has been charged as an adult with two counts of criminal homicide in the deaths of 26-year-old Kenzie Marie Houk and her unborn child. Houk was eight months pregnant with Brown's father's child, and also had two daughters, 7 and 4, who lived with her and the Browns.

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Police said Brown went downstairs from his bedroom with the gun hidden in a blanket, shot Houk in the head while she lay in bed, then took the bus to school. Brown is being held in the Lawrence County jail, though he is segregated from the adult prisoners. He has not entered a formal plea.

"It's tragic because a woman lost her life. The baby lost her life and you have an 11-year-old that's well on track to spending the rest of his life in jail," said Lawrence County District Attorney John Bongivengo.

Brown got the youth-size shotgun as a Christmas present and used it to win a turkey shoot on Valentine's Day, police said.

The 20-gauge shotgun was a gift from the boy's father, Chris Brown, according to Bongivengo. Brown was training his son to be a hunter, the New York Daily News reported. Houk had also encouraged Brown to buy the boy his own gun, according to the Daily News.

Youth model guns are generally shorter and lighter than regular rifles or shotguns and have lighter recoil, making them easier for children to use. Dozens of gun manufacturers offer both rifles and shotguns aimed at the youth market.

Gun Control Activist 'Outraged' by Youth Model Guns

Though not uncommon, the guns have been the target of criticism from some gun control activists, who say that children may not understand the danger of such weapons.

"To specifically market a gun designed for a kid is outrageous," said Paul Helmke, president of the Brady Campaign to Prevent Gun Violence, a gun control group. "To have a gun specially designed for junior, we're talking about a lethal weapon here, you're not talking about a toy anymore."

Pennsylvania State Trooper Ronald Kesten said police don't encounter the smaller guns very frequently and said they have not been a problem.

Bongivengo also said it was not uncommon for boys Brown's age to have their own shotgun, though he said the gun should have been locked up and inaccessible.

The gun was kept in a place to which the boy had full access, according to authorities.

Gun Safety Instructor: Nothing Wrong With Youth Model Guns

Graham Luck, who teaches a youth firearms safety course in Minnesota, said youth guns can be safer than regular guns, which can be too heavy for some smaller children. "The heavy guns can get away from them," he said.

"There's nothing wrong with firearms that fit young people," he added. "Kids need to be familiar with any kind of firearms. If he finds a gun in the house, it doesn't matter what kind it is."

Luck said children under 14 should not have access to the guns without parental permission and supervision.

The boy's attorney, Dennis Elisco, said he plans to ask the court to transfer the case to juvenile court and to transfer Brown to a juvenile facility, according to the AP.